Broadband and ISDN router in tandem, problems connecting

[DanielUK]

Hmmm, I'm not sure what is going on here.

Single domain, 2 x Win2k DC, handful of win2k clients.

I have been successfully using a broadband router between 3 clients, set up as a gateway (192.168.0.17) pointed at in Network settings on the respective machines. DNS server is our DC (192.168.0.1) with forwarders for the broadband ISP set up correctly.

Now, when I try to set up other clients to have their gateway settings point at our ISDN router (192.168.0.16), they appear to connect to the web/email etc but then the clients using the broadband router stop connecting/pinging outside. When I then unplug the ISDN router from the ISDN line so no connection can be made, the broadband clients seem to connect OK again, usually if I do an ipconfig /renew command.

I'm not sure what's going on, or if there's a correct way to set up two separate gateways on a win2k network that I'm missing? Forwarders for both IPs are set up in the DNS settings on the server.

Any ideas where to start on this one?

Thanks

Dan

 

[sab4you]

are both routers broadcasting their routing tables into your LAN?

I would turn off internal routing broadcasts on the ISDN

 

[DanielUK]

Thanks.

I'm not sure I saw anything related to this when I was setting up the isdn router (a Cisco 801). The same with the cheap netgear broadband router we're using, but I'll see about checking that tomnorrow when I'm back in work.

Thanks again,

Dan

 

[DanielUK]

I'm convinced the ISDN router is not broadcasting it's routing tables into the LAN. Also, the Netgear DG834 broadband router has "None" set for it's RIP direction selection, which I assume is correct.

Do I need to touch the win2k Routing and Remote Access?

Question: where specifically do the fixed IP addresses of the routers need to be showing? All I did was set the network properties of each win2k client to point to the gateway IP of the router I want it to use.

On the DC I have forwarder IPs set for both the broadband and ISDN providers dns servers, and the network settings of the DC has the broadband router listed as a gateway...does the ISDN router need to be listed here as an additional gateway or will that make things worse?

Dan